Sam from Santa Barbara, CA writes:

Dear Bar’s,

I decided to write to commend you for an outstanding product. I have a 2004 Pontiac Grand AM, V6 and with about 100,000 miles. About 6 months ago I had the Pontiac dealer flush the cooling system. I later noticed my car was slowly loosing coolant fluid with no evidence of a leak. At about the same time, my car developed an engine problem where it would misfire, rough idle when cold, and the “Check Engine” light would come on if I drove away too soon after starting the car. Unaware these problems were related, I had the Pontiac dealer replace the spark plugs and clean the fuel injectors per his recommendation. The problems did not go away even though I paid hundreds of dollars. To take care of the slow coolant leak, I decided to try Bar’s Stop Leak Liquid Aluminum. To my surprise, the engine problem my car had went away the very next day, and my car is no longer loosing coolant fluid! I am totally amazed and thankful for your product! It’s been two months now with my car running perfectly.

We very much appreciate you taking the time to write us, Sam.

As with any cooling system there are many components that could fail (thermostat, hoses, water pump, to name a few), causing another failure. We have had customers call saying they had the head gasket replaced yet had another failure less than 6 months later. For these reasons we cannot put a definitive number of months, years or miles on your Grand Am lasting before seeing another cooling system issue. We can say that we have had customers like you who have given great feedback of their vehicle going years and 40K miles after using our products.

Here is more information (including a full MSDS) on Bar’s Leaks Liquid Aluminum Cooling System Stop Leak.  As usual, if you have any additional questions, please feel free to ask.